Waterway, Rainbow, Jacuzzi

The Unicel C-4326 hot tub filter is one of the more popular sizes used in a range of spa brands and models. For optimal fit and performance, verify that this filter cartridge matches the dimensions of your old filter. Filter details: Unicel P/N: C-4326 Diameter: 4-15/16" Length: 13-5/16" Top: 2-1/8" Open Bottom: 2-1/8" Open Media: 25 sq.ft. Filter Media: 3oz Reemay Pleat count: 106 Compatible replacement for the following OEM filters: Beachcomber Spas 3005845 Pleatco PRB25-IN Master Deluxe M42513 Filbur FC-2375 Master Deluxe M42513 Coleman 100586 CMP 25392 Jacuzzi J200 Series that use the 373045 Filter Unicel M-4326 Waterway 817-2500 Pentair RDC R173429 Pentair Dynamic Series I - RDC 17-2327 Watkins, Hot Springs, Hot Spot 33521 Coleman Spas 3301-2242 How long should Unicel hot tub filters last? While most hot tub filters need to be changed every six to twelve months, Unicel brand filters are made with REEMAY premium trilobal filtration media that delivers 45% more surface area over standard rounded filter fibres and can last up to 18 months or more, depending on your level of hot tub use and filter cleaning routine.